Chemical fire-extinguisher.



PATENTED JUNE 18, 1907.

I. B. THOMAS. CHEMICAL FIRE EXTINGUISHER.

APPLICATION FILED JAN. 8, 1906.

THE NURRIS PETERS ca., wlsumc'rou, n. c.

UNITED STATES PATENT OFFICE.

f JESSE B. THOMAS, OF BOSTON, MASSACHUSETTS, ASSIGNOR OF ONE-HALF TO ALFRED J. KNIGHT, OF BROOKLINE, MASSACHUSETTS.

CHEMICAL FIRE-EXTINGUISHER.

No. 857,544. Specification of Letters Patent. Patented June 18, 1907. Application filed January 8,1906. Seria N- 295,003.

To all whom, it may concern: 1 Figure 1 is a vertical diametral section of Be it known that I, JEssE B. THOMAS, a the upper portion of a chemical fire extincitizen of the United States, and a resident of guisher embodying one form of my inven- Boston, county of Suffolk, State of Massachu- 1 tion, a portion of the acid-bottle and its gravsetts, have invented an Improvement in ity stopper being shown in elevation; Fig. 2 60 Chemical Fire-Extinguishers, of which the is a similar view showing a different form of following description, in connection with the j bottle-holder and manner of suspending the accompanying drawings, is a specification, 1 same, with a combined bottle-stop and guide like letters on the drawings representing like j for the stopper when the extinguisher is in- IQ parts. verted, Fig. 3 is a like view, showing a bot- 6 This invention relates to chemical fire extle-holder similar to that shown in Fig. 2, tinguishers of the type wherein an acid rebut with different means for retaining the ceptacle or bottle is contained within a canisacid-bottle in place, and illustrating the stopter provided with a suitable alkaline solution, per-guide at the center of the cover; Fig. 4 is the acid-bottle being provided with a stopper a diametral section of the screw cover shown 70 which opens the bottle mouth when the exin Figs. 1, 2 and 3, and Fig. 5 is a modified tinguisher is inverted for use, to effect the form of closure for the canister, to be rerequisite commingling of the acid and alkaferred to. line contents. The sheet-metal canister 1, of well known My invention has for its objects the proshape and construction (only the upper por- 75 duction of certain novel features of construc tion being herein shown) has a nipple 2 for tion whereby the closure and sealing of the the usual hose 3, and the open upper end of canister is effected in abetter and more effectthe canister is soldered or otherwise tightly ive manner than is now attained while elimisecured to an upright neck 4, Figs. 1, 2 and 3,

nating certain objectionable features, and said neck having an external screw-thread 5. 80 my invention also comprehends simple and An internal flange or shoulder 6 on the neck efficient means for suspending the acid-botis provided on its upper face with an annular tle and for guiding the stopper thereof when seat 7, to receive a packing ring or gasket 8 the extinguisher is used. a of rubber or other suitable packing material,

Canisters have heretofore been provided the outer side wall of the seat being shown 5 with a threaded neck to engage a cover which as undercut at 9 to hold the packing ring in is screwed down upon a packing ring or the seat, the inner wall of the latter being gasket, to tightly seal the canister, but at shown at 10. times the screwing on of the cover-displaces A circular, imperforate metal cover 11,

5 or injures the packing, decreasing the sealing preferably concavo-convex as shown, is pro- 90 efficiency, and so too, when a cover has been vided with an annular depending portion or undisturbed for some time the deterioration lip 12 on its under face adjacent its periphery,

of the packing, or corrosion, will cause the to rest upon the packing ring, the diameter 0 cover to bind so tightly that frequently it is the cover being such that it will slip readily o bent or broken, or other parts of the extininto the part of the neck 1 projecting above 5 guisher injured, in the effort to remove the the packing. At its center the cover is cover. In my present invention the sealing shaped to present a hollow projection 13, for ressure exerted upon the packing is a direct a purpose to be described, the lip 12 being of force acting at right angles to it, with no rosuch thickness that it will engage only the 4 5 tative or twisting action the closing means packing ring, and no portion of the seat 100 for the canister comprising a cover whichthereof. closes the opening of the canister, and a sep- An internally screw-threaded, annular cap arable cap which is adapted to be screwed 14 is adapted to engage the thread 5 of the upon the canister neck and by direct engagecanister neck, and to be screwed down therement with the exterior face of the cover on, a circular rim 15 secured to the cap by 10 makes a sealing engagement with thepacking. arms 16 affording a firm grasp in opening an The various novel features of my invention closing the extinguisher and also in using the will be fully described in the subjoined specisame. The open center of the cap permits fication and particularly pointed out in the the projection 13 of the cover to extend following claims. through it, and by reference to Figs. 1, 2 and no 3 it will be seen that t the exterior face of th the lip 12.

closing the canister.

movement whatever t a powerful, straight (l rectly applied, so that abrading action betwe faces of the opposed packing ring.

In order to reduce the friction between the cap and cover when screwi I prefer to provide the cap with a series of separated engaging portions or lugs 17, most clearly shown in Fig. 4, which bear upon the The construction so far described is the same in Figs. 1 to 3 inclusive seen that even should the teriorate or corrode suifici the cover the cap can be easily unscrewed and thereafter the cover can be readily released.

By the construction describe seal can be secured with a muc penditure of force in screwing as there is no drag overcome between the packing and the cover engaging the same.

eferring to Fig. 1,

threaded hub whi pending tubular and boss 21 on the cover 11 tle is suspended from t ter. A cross-brace 22 o displacement of the b guisher is inverted, an closes the bottle n10 guisher is in normal,

stopper having an ou 24: When the exting said projection enter hollow projection 13 guided thereby, being sume its closing positi the extinguisher is aga In Fig. 2 the bottle sheet metal, having a diameter than the b0 to permit the content ister to commingle w he cap directly engages e cover, but at or near its periphery, substantially directly above he cap is apdown, forcing he lip 12 into he packing ermetically is no rotative o the cover, but only ownward pressure dithere is no rubbing or en the contacting surannular lip and the ng down the former and it will be packing ring de-- ently to stick to d a hermetic 11 smaller exdown the cap, or resistance to be the acid-bottle 18 is supported in a cage-like holder 19, having a ch screws onto a deexternally threaded so that the acidbote cover in the canisn the holder prevents ottle when the extind a gravity stopper 23 uth when the extinupright position, said ter tapered projection uisher is inverted the s the boss 21 and the of the cover, and is held in position to re- 011 on the bottle when rned upright.

-holder 25 is made of 11 open bottom of less ttle, and with holes 26 s of the bottle and canhen the extinguisher is used. At its upper end the bottle-holder has a lateral annular flange 27 which rests upon depends from the cover 11, to abut against the breast of the acid-bottle 18 when the extinguisher is inserted, said stop loosely surrounding the gravity stopper 23 and assisting the hollow projection 13 in guiding the same, said tubular stop being perforated at 29.

The bottle-holder slides snugly into place within the annular flange 6 of the neck, and can only move against the cover 11 when the canister is turned upside down.

In Fig. 3 the bottle-stop just referred to is omitted, and instead the tubular bottleholder 25 has externally secured to it spring wires 29 upturned against its sides and bent at 30 to project through adjacent ones of the holes 26 above the breast of the bottle 18, the wires springing outward when the bottle is pushed into the holder or drawn out therefrom. The upper, free ends of the wires extend between the bottle-holder and the flange 6 on the canister neck 4, and the flange 31 is made a little wider than the flange 27, Fig. 2, to bridge the space and rest on the wall 10 as before.

In Fig. 3 the hollow projection 13 of the cover 11 serves as the sole guide for the stopper 23, receiving the projection 24 thereof when the stopper drops away from the bottle mouth as the extinguisher is reversed, and directing the stopper back and prevei'iting its displacement when it again seats on the bottle.

While I have thus far shown the packing ring as held in a seat on the interior of the neck of the canister, with the opposed sealing Referring to said Fig. 5 the neck 32 of the canister 1 is externally threaded, as before, for the cap 14, the construction of the latter being the same as has been already described, but the neck has an upturned annular lip 33 to co-operate with the packing ring or gasket 34 held in an annular seat 35 formed in the under face of the cover 36. The inner side wall of the seat is shown as undercut at 37 to hold the packing ring in place, the lip 33 and packing ring being opposed and forced into sealing engagement by screwing down the cap 14, the latter bearing directly on the exterior face of the cover 36, as before. Said cover is provided with the central hollow projection 38, for the purpose previously set forth, and as the bottle-holder cannot in this arrangement be conveniently suspended from the neck of the canister I prefer to use the suspending means and such a bottle-holder as shown in Fig. 1. For this purpose, the

the top of the inner side wall 10 of the packcover 36 is provided with the depending and ing seat 7, so that the holder is suspended in externally threaded boss, 39, Fig. 5. It will a detachable manner from the neck of the be seen that not only does the hollow procanister.

ection on the cover serve as a guide for the A tubular bottle-stop 28 is secured to and stopper, but it also serves as a handle or hand-piece by means of which the cover can be easily lifted into place, or removed from the canister after the retaining cap has been unscrewed.

Whichever embodiment of my invention is concerned it will be manifest that the sealing of the canister is effected by the cooperation of an annular lip and an opposed annular 1 packing, the sealing being effected by rect downward pressure upon the said two parts, without any rotative or abrading movement of the one relative to the other. j Having fully described my invention, what I claim as new and desire to secure by Letters Patent is 1- 1. In a chemical fire-extinguisher, a canister having an externally-threaded neck, a cover having an outwardly extended stopper guide formed thereon, an annular lip on one and an opposed annular seat on the other of said members, a packing ring in the seat, to be engaged by the lip, an acid receptacle suspended within the canister, a gravity stopper therefor, and a cap having an open center to permit the stopper-guide to pass through it and adapted to screw onto the neck and directly engaging the exterior face of the cover, to force the lip into sealing engagement with the packing ring as the cap is screwed down.

2. In a chemical cover having a central hollow projection 1ntegral therewith and forming a stopper guide, an annular lip on one and an opposed annular seat on the other of said members, a packing ring in the seat, to be engaged by the lip, an acid receptacle suspended within the i canister, a gravity stopper therefor, and a cap having an open center and adapted to screw onto the neck and directly engaging the exterior face of the cover, to force the lip into sealing engagement with the packing ring, as the cap is screwed down, the hollow fire-extinguisher, a canisj ter having an externally threaded neck, a j

projection on the cover extending through the openin in the cap.

3. In a c emical fire extinguisher, a canister having an upright, externally threaded neck provided with an internal horizontal flange below its top, an annular seat in the upper face of the flange, the outer side wall of .the seat being undercut, a packing ring in the seat held in place by the undercut wall, an acid-bottle holder detachably suspended from the imier wall ofthe seat, inside the packing ring and out of engagement therewith, a cover having a dependlng annular lip to bear upon the exposed face of said packing ring between the inner and outer walls of the seat, and a cap to screw upon theneck and directly engaging the exterior face of the cover to force the lip thereof into sealing engagement with the packing ring.

4. In a chemical fire-extinguisher, a canister having an externally threaded neck, a cover having a central hollow projection, outwardly extended therefrom, an annular lip on one and an opposed annular seat on the other of said members, a packing ring in the seat, to be engaged by said lip, an acidbottle, a holder therefor detachably suspended within the canister, a gravity stopper for the bottle and guided by the hollow projection on the cover when the extinguisher is inverted, and an annular cap adapted to screw onto the neck and having a series of separated lugs integral therewith to directly engage the exterior of the cover, to force the lip and packing ring into sealing engagement, the hollow projection on the cover extending through the open center of the cap.

In testimony whereof, I have signed my name to this specification, in the presence of two subscribing witnesses.

JESSE B. THOMAS.

Witnesses:

JOHN C. EDWARDS, ELIZABETH R. MORRISON. 

